Q: The guy I'm sleeping with is good in bed, but he has bad knees, which means he cannot do certain positions. The usual ones have gotten old, but he refuses to get knee surgery. What should I do?

Steve: He needs yoga. Has he ever tried it? Yoga increases your flexibility, even if you're injured. Tell him you'll join him in yoga. I guarantee the sex will be better for both of you. Oh, and tune in to tantric sexuality music online - that should make it better still.

Mia: Try side-by-side positions such as spooning. This should take the pressure off his knees, but also give you some variety. Or if he has long legs, you can try using a chair. As long as you're doing most of the movement, this shouldn't aggravate his knees too much. Whatever you do, go slow, and ask questions so you don't make a bad situation worse.

Q: I've been dating a guy off and on for five years or so. One of the reasons I was attracted to him is that he had a full head of curly hair and a beard. We weren't in a real relationship. I was just in it for the sex. The other day, he showed up clean-shaven. My juices stopped flowing. I'm so not attracted to him like that. Should I wait until all his hair grows back?

Mia: Wait and deprive yourself of sex in the meantime? Don't be silly. Close your eyes, and do it anyway. It's good practice for when you're in a real relationship and will be called upon to have sex when you're not exactly jumping up and down with excitement to do it. Don't forget to practice safe sex.

Steve: New things are always a challenge, but if it's the same guy, the sex shouldn't be that different. Give it a try. If something's off, you might try finding a man who actually cares for you.

Between them, Steve and Mia have logged more than a few decades in the single and dating world. They're also wise to the ways of married life. They don't always agree, but they have plenty of answers. Contact them at S&M c/o Daily News, 801 Market St., Philadelphia, PA 19107 or steveandmia@phillynews.com.